Hello,
I have a DS2072A with upgrade to DS2302 (300MHz)
After upgrade I recognized that the low frequency and DC performance is not good as before. Therefore I did the Self Calibration. But the calibration did not help. The calibration makes it worse.
![Sad :(](https://www.eevblog.com/forum/Smileys/default/sad.gif)
For example:
Test Signal: 1 MHz Sinus with 0dBm = 224mV RMS
Measured with Boonton RF- Millivoltmeter 92E:
224mV RMSMeasured with DS2072A before upgrade:
224mV RMS (@500ns)
Measured with DS2072A after upgrade:
227mV RMS (@500ns)
After calibration I measured:
233mV RMS (@500ns)
My Questions:
1. Is there any way to get the factory calibration back ? (Factory Reset....)
2. Is there a possibility to control the internal (DC) voltage reference?
3. Exists any Service Mode or Service commands ?
Or any other ideas ?
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Test gear:
Signal Generator IFR2023B
TRUE RMS RF Level Meter RACAL DANA 9303
BOONTON RF Millivoltmeter 92E
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Many thanks for help
Willi